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检查XML节点具有特定值的属性名称 - 使用Linq解析XML

[英]Check XML node have attribute name with specific value - Parse XML using Linq

First I apologize for creating a new question about XML parsing using Linq 首先,我为使用Linq创建一个关于XML解析的新问题而道歉

<?xml version="1.0" encoding="UTF-8"?>
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"
    xmlns:epub="http://www.idpf.org/2007/ops">
    <head>
        <meta charset="utf-8"></meta>       
        <link rel="stylesheet" type="text/css" href="epub.css"/> 
    </head>
    <body>
        <nav epub:type="toc" id="toc">          
            <ol>
                <li>
                    <a href="text.xhtml">The System</a>
                </li>   
                    <li>
                    <a href="text1.xhtml">The Option</a>
                </li>   
            </ol>           
        </nav>
           <nav epub:type="landmarks" id="guide">
            .......
            .......
           </nav>
    </body>
</html>

I am trying to check nav tag having the attribute epub:type with value toc & which get into & 我正在尝试检查具有属性epub:type nav标签epub:type值为toc &进入&

  • tags collect all tag info. 标签收集所有标签信息。

    To achieve this I started to get the <nav> tag which having attreibute epub:type with value toc 为了实现这一点,我开始获得<nav>标签,该标签具有attreibute epub:type with value toc

      var xDoc = XDocument.Load("nav.xhtml"); var result = (from ele in xDoc.Descendants("nav") select ele).ToList(); foreach (var t in result) { if (t.Attributes("epub:type").Any()) { var dev = t.Attribute("epub:type").Value; } } 

    But every time the result count is zero. 但每次result计数为零。 I wonder what is the wrong in my XML. 我想知道我的XML有什么问题。

    Can you please suggest me right way. 能否请你正确的方式。

    Thanks. 谢谢。

  • This is a namespace problem. 这是命名空间问题。 You're looking for nav elements without specifying a namespace, but the default namespace is "http://www.w3.org/1999/xhtml" . 您正在寻找nav元素而不指定命名空间,但默认命名空间是"http://www.w3.org/1999/xhtml" Additionally, you're looking for your epub attributes in the wrong way. 此外,您正在以错误的方式查找您的epub属性。

    I suggest you change your code to: 我建议你将代码更改为:

    var xDoc = XDocument.Load("nav.xhtml");
    XNamespace ns = "http://www.w3.org/1999/xhtml";
    XNamespace epub = "http://www.idpf.org/2007/ops";
    
    foreach (var t in xDoc.Descendants(ns + "nav"))
    {
        var attribute = t.Attribute(epub + "type");
        if (attribute != null)
        {
            ... use the attribute
        }
    }
    

    Or if you want to modify the result in your if statement, just call .ToList() at the end of the Descendants call: 或者,如果要修改if语句中的结果,只需在Descendants调用结束时调用.ToList()

    foreach (var t in xDoc.Descendants(ns + "nav").ToList())
    

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